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OH
OH
CO 2 H
O
O
O
HO
31
36
O H
CO 2 H
CO 2 H
O
HO
32
37
F
O H
CO 2 H
CO 2 H
O
O
33
38
O
OH
CO 2 H
CO 2 H
O
O
7
34
39
OH
OH
CO 2 H
CO 2 H
O
35
40
Fig. 1.9 The C-1, C-1′, and C-4′ modified ABA analogues
of these ABA precursors results from ABA being generated from them in plants.
Since plant cells generally exhibit high esterase activity and rapidly hydrolyse
esters (Kusaka et al. 2009 ), the activity of Me ABA must also result from its con-
version to ABA by enzymatic hydrolysis.
The other two polar groups in ABA are also important for ABA activity,
although they are less crucial than the C-1 carboxy group: The reported activities of
 
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